Method of making core boxes



Feb. 16, 1932. J. H. LAUKEL 1,345,502

' METHOD OF MAKING CORE BOXES Filed April 2, 1930 INVENTOR ATTORNEY molding surface.

Patented Feb. 16, 1932 @NITED STATES JOHN H. LAUREL, OF DETROIT, MICHIGAN METHOD OF MAKING CORE BOXES Application filed April 2, 1930. Serial No. 441,126.

The present invention pertains to an improvement in the method of making a core box by electro deposition as disclosed in the pending application of Arthur K. Laukel, Serial No. 106862, filed January 13, 1926, and the patent of Arthur K. Laukel, Serial No. 1,649,312 of November 15, 1927. The present invention is described herein in connection with a core box but it should be understood as being applicable generally to hollow bodies in the nature of molds or dies.

In such bodies it is preferablethat the parting surface consist of a harder metal than the deposited copper forming the working or Hitherto the parting surface has been provided in the form of a face plate of a suitable metal cut to surround the margin of the cavity. Considerable time and careful work were required in cutting the plate to accurate internal dimensions.

The object of the present invention is to simplify this operation and reduce the time required in preparing the face plate. This obJect is accomplished by making the opening of the face plate of smaller size than actually required and fitting the edge of the openin into a peripheral groove cut inthe back 0 the solid object on which the deposit is to be made. After completion of the de- ;l; position and removal of the solid object from the deposit, the inner edge of the face late is readily trimmed to proper size by filing or similar means. To facilitate the trimming operation the inner edge of the face plate is made thin or beveled.

The invention is fully disclosed by way of example in the following description and in the accompanying drawings in which Figure 1 is a bottom plan view of the solid object to which the face plate is to be applied and on which the deposition is to be made;

Figure 2 is a plan view of the faceplate;

Figure 7 is a similar view showing a deposit and face. plate separated from the cathode, and

Figure 8 is a cross sectional View of the finished core box.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

F or the purpose of description it may be assumed that the core box is to produce an object substantially similar to that shown in Figures 1 and 3. This object is in the nature of a split core 1 having a flange or core print 2. The core is of a material adapted to function as a cathode in an electrolytic bath and may consist of metal or a plastic material treated to have a conducting surface. It will be apparent that a deposit made upon the core is suitable for reproducing similar cores.

In Figure 2 is illustrated the face plate 3 which is to surround the margin of the cavity of the deposit formed on theicore l. The plate consists of a metal of the desired wearing qualities and has an openin 4 which is approximate to the marginal con 'guration of the base of the core 1. Hitherto the opening has been carefully shaped to the exact size of the base of the core, but in the present instance the opening is smaller than the base of" the core and is cut rather roughly and with a smaller expenditure of time. It is contemplated that the deposit formedv on the core 1 attach itself to the face plate as described in the above mentioned pending application.

The cathode is assembled in the manner shown in Figure 5 by providing a base 5 and securing the face plate thereto by means of screws 6 which pass through the base and enter tapped holes 7 previously formed in the face plate. The core 1 is also secured upon ously formed with a peripheral notch 8 in the thebase within the opening 4 and is previbase or parting surface thereof in order to receive the edge of the opening 4 which, as already stated, is smaller than the base of the core. The inner edge of the face plate is beveled as at 9 or otherwise thinned to facilitate the finishing of the core box as will presently appear. The edge 9 partly fills the groove 8 and the remainder of the groove is packed with a suitable material 10 adapted to conduct current on the exposed surface thereof which is made flush with the marginal wall of the core.

After preparing the assembled cathode for immersion in the bath, the cathode is sub jected .to electroplating, and a deposit 11 is formed thereon. The margin 12 of the face plate is preferably insulated so that no deposit will form thereon, but it will be seen in Figure 6 that the deposit attaches itself to the beveled edge 9 outside the groove 8.

After a sufficient deposit has accumulated, the deposit with the face plate is removed from the cathode as shown in Figure 7. The deposit is preferably reinforced by a suitable backing consisting of a cast member 13 screwed to the'face plate and filling material 14 between the deposit and the cast member. The opening 4 in the face plate may now be enlarged to proper size by trimming or filing the thin edge thereof as indicated by the numeral 15 until it is flush with the adjacent wall 16 of the deposit. In this operation the wall 16 serves as a gauge by which the proper amount of filing or trimming is determined.

It will now be apparent that an accurate face plate is ultimately provided by operations which are considerably simpler and require less time than those hitherto employed.

What Ilclaim is:

1. A method of forming a shell member having a pre-formed face and a deposited body consisting in providing an object having a protuberance of the dimensions of the cavity of the shell member to be formed, cutting a groove in the base of said protuberance, placing a pre-formed face plate around said protuberance with the inner edge of said plate inserted in said groove, preparing said object for electro-plating, depositing metal upon said protuberance and on the inner margin of said face plate, removing said object from said deposit and face plate and removin the inner edge of said face plate until it orms a continuation of the adjacent inner lateral wall of the cavity Within the deposited metal.

2. A method of forming a shell member having a pro-formed face and a deposited body consisting in providing an object having a protuberance of the dimensions of the cavity of the shell member to be formed, cutting a groove in the base of-said protuberance, providing a pre-formed face plate with a thinned inner edge, placing said preformed face plate around said protuberance with the inner edge of said plate inserted in said groove, packing said groove with a conductive material, preparing said object for electro-plating, depositing metal upon said protuberance and on the inner margin of said face plate, removing said object from said deposit and face plate and removing the inner edge of said face plate until it forms a continuation of the adjacent inner lateral wall of the cavity within the deposited metal.

3. A method of forming a shell member having a pre-formed face and a deposited body consisting in providing an object having the dimensions of the cavity of the shell member to be formed, cutting a groove in the base of said object, mounting said object on the packing, placing a preformed face plate around said object with the inner edge of the plate inserted in said groove, preparing said object for electro-plating, depositing metal upon said object and on the inner margin of said face plate, removing said object and mounting from said face plate and deposit, and removing the inner edge of said face plate until it forms a continuation of the adjacent inner lateral wall of the cavity within the deposited metal.

4. A method of forming a shell member having a pre-formed face and a deposited body consisting in providing an object having the dimensions of the cavity of the shell member to be formed, cutting a groove in the base of said object, mounting said object on a packing, providing a pre-formed face plate with a thinned inner edge, placing said preformed face plate around said object with the inner edge of the plate inserted in said groove, packing said groove with a conductive material, preparing said object for electroplating, depositing metal upon said object and on the inner margin of said face plate, removing said object and mounting from said face plate and deposit, and removing the inner edge of said face plate until it forms a continuation of the adjacent inner lateral wall of the cavity within the deposited metal.

In testimony whereof I affix my signature.

JOHN H. LAUKEL. 

